Stuffing box



March 24, 1925.

A.l LEVEDAHL STUFFING Box A original Filed July 3o, 919

jr@ l/@daga Patented Mar. 24, 1925.

` UNI-TED STATES ATE NT f OFF IC AXEL LRvED-AHL, or `AURORA, yILLINOIS, As'sIGNoR TOINDRPENDRNT PNEUMATIC TOOL COMPANY, OF CHICAGO, ILLiNoIs, A CORPORATION OR DELAWARE.

sTUrRiNG" BOX.

original appliaridav mea .my-'30, 1919, serial Nb. 314,374. Divided andthis application fired May To all whom #may con-cern:

Be it known that' 1, AXEL L'EVRDAHL, a citizen of the United States, residing at Aurora., inthe county ofiKane and Stateof Illinois, have invented new and yuseful Improvements inv St'uiing'BoXes, of which the following 'is a specification.

This invention relates to stuffing boxes particularly adapted for pneumatic tools'of' that type wherein the piston inI the barrel has a rodY extending through an end ofthe Figs. 3 and 4 are transverse ,sectional views taken on lines 3-3'and 4 4, respectively, of'Fig. 2; and

Fig. 5 is a sideelevational'view of the locking pin and its spring', removed from the tool.

In the drawings, I have shown ythe stuf-V i'ing box of'my invention embodied in a pneumatic sand rammer of the oor type,

such as is described a-ndvclaimed ,inr my co-y pending application Serial No; 314,374,l filed July 30, 1919, and'of which the present aapplication is a division.

As shown herein, saidl sand raininer has a barrel 1I to theinner end of'which issecured a valve housing nor head 2 rcontaii'iing a distributing valve of the diiferential'pressure area type, as well kno-wn in this art. To the 'head' 2 'is` secured a throttle `valve stem 3, through which live air is supplied to the tool. For controlling the air supply, a. throttle valve is mounted in the stem, and the valve is held normally closed by a. spring and moved into open position by the Operator grasping a lever 4 pivoted on the outside of the stem and moving it toward and against the stem. The barrel 1 has the usual bore 5 for a reciprocating piston 6 provided with a rod 7 extending through and beyond serial` No. 384,515.

head 2. As set forth in my said c'opending application, thev overall length of the' tool is suoli that it permits the operator to handle and operate the tool whilestanding in' an erect' positioinv with the stamper or pee'n 8 reaching a .molders ask on the floor.V

The piston rod 7 extends'through the stuf-y ling box 10 of my invention, and tohold the piston and its connected-rod 7 against vrota'- tion, the stufling bo'X4 isv constructed 'tomhave parts to interlock with the'barrel 1 and fit in a plurality of longitudinally extending flutes or grooves 11, 11 in said rod. Saidy box comprises a metallic inneriing 12 bearing `fla-twiseagainst an annular shoulder 13 at that end ofthe barrel.: This' ring may or may not be vprovidedwith inwardly projecting pistons-'to fit in the' llu'te's'll. There' is a second ring 14'in` the barrel', and this ring has an outwardly projecting radial lug 15 (Fig. Y4) extending intoa longitudinall groove 16 in the barrel. This' groove 16 opens through the -outer end of the barrel to permit the ring 14 toy be'inserted'into' and removed therefrom. vBetween said rings 12 and 14 are interposed compressible' gasket-sl 17 preferably of chrome friction leather. lThe outerv ring 14 and' gaskets may also bev provided'` with parts fitting inthe flutes '11.

To hold the 'gaskets compressed, I providel` a nut 'having a'body 18 screwed into the open end of the .barrellabout the piston rod.1 The nut 'a'c'ts'on the 'outer' ring 14 to' for'ce' it to'- Vward the inner ring 12 and compress the gaskets 17 between them. The engagement of the lug 15 on the ring 14 with the groove 16 holds the ring from turning when loosening or tightening the nut, and further serves To the. outer to hold the packing 17 from turning when t and is larger in diameter than the body portion 18, as shown. The head has one or more peripheral holes 20 to receive a spanner wrench or other device to tighten or loosen the nut or to remove it entirely. To lock the nut against accidental turning and thus prevent relieving the compression on the gaskets, I provide in the face of the head 19 toward the barrel, a plurality of circumferentially spaced, countersunk depressions or recesses 21, 2l, and with which cooperates a locking pin 22 projecting beyond the end of the barrel and having a conical shaped outer end to enter said depressions and to ratchet therewith in the turning of the nut. Th e depressions have a complementary shape 'tor this purpose. By this feature, the pin will slip from one depression to another as the nut is turned, thus avoiding the necessity of being required to manually withdraw the pin from each depression belore the nut may be turned. Said pin 22 is slidably mounted in a recess 23 formed in the end ot the barrel and which recess is longer than the pin. The inner end of the pin is reduced as at 24 to receive the adjacent end of a coiled expansion spring 25, which forces the pin forwardly toward and holds it yieldably in engagement with the head 19. The last several loops 26 at the opposite end of the spring are of a diain'eter slightly in excess of that of the recess 23 to rictionally hold the spring therein, and as the loops at the opposite end of the spring tightly engage the reduced end 24; or" the pin, the latter and the spring are prevented from dropping or being projected out of the recess 23 when the nut is removed. Thus, the pin is carried by the barrel and will not be lost or misplaced whenrthe nut is removed. The nut may be readily turned to increase or decrease the amount of compression on the gaskets, and the pin 22 will hold the nut from accidental turning and thus hold the compression on the gaskets.

The pin 22 is provided adjacent its outer end with a groove 27 to permit a screwdriver or other implement to be engaged with the pin to loosen the same should it bind or stick in its recess 23, and also to enable the pin to be completely removed from said recess whenever the occasion demands.

While I have shown and described herein in detail my improved stuffing box as embodied in a sand rammel' of the kind shown,

it is to be of course understood that the box could be equally as well embodied in other types of tools where stuthng boxes are needed. Furthermore, it is to be understood that the details of construction and arrangement of parts shown and described may be variously modified and changed without departing from the spirit and scopeV of my invention.

I claim as my invention:

l. In a locking device, the combination with a body member, of a nut screwed thereon and having a flanged head with a plurality or conical recesses facing said body member, a locking pin slidably mounted in said body member and having a conical outer end to engage said recesses for holding the nut against accidental rotation, and a spring in said body member pressing outward against said pin for yieldably holding the same against said head, said spring tightly engaging the body member and pin, respectively, for holding the pin from dropping from the body member when the nut is removed.

2. In a locking device, the combination with a body member, of a nut screwed there-V on and having a flanged head with a plural- 'ity of conical recesses, a locking pin slidably mounted in a bore in said body member and having a conical outer end to engage said recesses, said pin having a reduced inner end, and a spring in said bore behind said pin for pressing the same outward against said head, said spring having the loops at one end tightly engaging about the reduced end of said pin and having the loops at its opposite end slightly greater in diameter than said bore for holding the Vspring and pin/therein when the nut is removed.

3. In a locking -device, the combination with a body member, of a nut screwed thereon and having a flanged head with a plurality of conical recesses facing the body member, and a spring pressed locking pin slidably mounted in the body member and having a conical outer end to engage said recesses, said pin having an annular groove adjacent its conical end and accessible between the nut and body member.

In testimony that I claim the foregoing as my invention, I aHixmy signature this 24 day ci' May, A. D. 1920.

AXEL LEVEDAHL. 

